Model Adrienne N. Martin (PICTURE) Found Dead At August Busch IV's Home

HUNTLEIGH, Mo. (CBS/KMOV/AP) Police found the body of a 27-year-old aspiring model in the upscale suburban St. Louis home of ex-Anheuser-Busch CEO August Busch IV.

The woman was identified as Adrienne N. Martin, of St. Charles, Missouri.

Police were called on Dec. 19 to the St. Louis suburb of Huntleigh and found her body in Busch's gated home.

St. Louis County forensic administrator Suzanne McCune said Thursday there were no signs of illness or trauma. An autopsy was conducted but toxicology results could take four to six weeks.

A statement from Frontenac police said the department received an emergency call about an "unresponsive person" at the home. Martin was deceased when paramedics and officers arrived, the release said.

The news release did not say if the death was considered suspicious, or why news of the death was not announced until four days later.

Art Margulis, an attorney for Busch, said Martin was a friend of Busch who was visiting the home and there was "absolutely nothing suspicious" about her death.

"It was a tragic death of a young woman," he said. Margulis told the St. Louis Post-Dispatch that Martin and Busch had been dating for at least a year.

Margulis did not confirm or deny whether Busch was at home at the time of Martin's death, according to CBS Affiliate KMOV.

McCune declined to speculate on the investigation or the cause of death. The St. Louis Post-Dispatch quoted an unnamed law enforcement source as saying the case was being investigated as a possible overdose. McCune would only say that an overdose was among the possible causes.

Update: Police have released the 911 call. Listen to it here.